Method and apparatus for the production of sheet-glass.



J. PLAYER. METHOD AND APPARATUS FOR THE PRODUCTION OF SHEET GLASS.

I APPLICATION FILED'0GT.1,190B. 952,354.

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Patented Mar. 15, 1910.

J. PLAYER.

METHOD AND APPARATUS FOR THE PRODUOTI 0N OP SHEET GLASS.

' 3 SHEETSSHEET 2.

Patented Mar. 15, 1910.

VJ. PLAYER. METHOD AND APPARATUS FOR THE PRODUCTION OF SHEET GLASS.

APPLIOATION FILED OCT. 1. 1908, 95g35 Patented Mar. 15,1910.

3 SHEETS-SHEET 3.

tinirnn rn'rns Pfitililllhii @FFEUE.

JOHN PLAYER, 0F RIVER FOREST, ILLINOIS.

METHOD AND APPARATUS FOR THE PRODUCTION OF SHEET-GLAS$ Specification ofLetters Patent. p mm E gar, i5, 193(1),

Application filed October 1, 1908. Serial No. 455,659.

' To all whom it may camera:

'Be it known that I. JouN Pnn'nn, of River Forest, Illinois, haveinvented a new and useful Method and Apparatus for the Production ofSheet-Glass, which invention is fully set forth in the followingspecification.

This invention relates to the art of drawing sheet-:glass, and moreparticularly to the drawing of a continuous sheet of glass andannealingthe same.

Heretofore it has been proposed to draw a sheet of by inserting asuitable bait in a mass of molten glass and slowly lifting the bait outof the mass of molten glass, while simultaneously counteracting thetendency of the sheet to narrow during the drawing operation, and thenturning the upwardly moving sheet over a suitable bending roll onto asubstantially horizontal 'carrier by which it was passed into theannealing leer. In this method, the draft was generally applied to thebait by positively connecting it to a suitable source of power,

and after the sheet of glass has been drawn a' sufficient length to beturned over the bending roll and placed upon the horizontal carrier,suitable devices, actuated from a suitable source of power, have beenprovided for positively gripping the sheet and advancing it, saiddevicesbeing either independent of theearrier or coacting with the carrier toeffect the positive gripping of the sheet. This means of effecting thedrawing action upon the sheet is objectionable, not only because thegripping devices are liable to mar the sheet where they grip the same,but because their construction and operation tend to unnecessarilycomplicate the mechanism as a whole. Furthermore, in annealing the sheetof glass according to the methods heretofore practiced, the sheet hasbeen passed into the annealing leer and onto a suitable carrier by whichit was advanced through the long leer in which the temperature graduallydecreases from that end of the leer where the sheet enters to the exitend of the leer. By this method the upper surface of the sheet isdirectly exposed to the atmosphere of the leer, while the under surfaceof the sheet is more or less protected from the atmosphere of the leerbyits contact with the carrien, and it has been found that the continuoussheet sometimes cracks owing to the unequal contractions occurring whilethe sheet passes till'Ullgil LUU leer. Particularly is this the casewhere the leer inospheric conditions like.

.\nother object of the present invention, therefore, is to draw thesheet of glass and continuously pass it into and through the annealingleer, while protecting it from the uneven contraction and otherdisadvantageous results incident to the methods here-- tofore employed.

With these dajects in view, the invention consists, first, in a methodof drawing sheet glass by preparing a mass of molten glass, drawing thesheet upwardly, and preferably vertically,from said mass, and thenturning the drawn sheet from its upward or vertical position to anapproximately horizontal direction onto a suitable carrier, andcontinuing the drawing operation by applying the draft to the drawnportion of the sheet through the frictional contact of said sheet withthe carrier.

To initiate the drawing operation, a suitable bait is lowered into themass of molten glass attached to cables or chains, which extendvertically upward into the forward end of the leer and over a suitablehorizontal roll, hereinafter characterized as the bending roll, and arethen attached to a weight resting on, but not otherwise attached to, thecarrier in theleer, "When the bait has become sutliciently "heated tocause the glass to adhere thereto, the machine is started and the weightis slowly carried along by. the carrier table, and, the mass of thisweight being such that its inertia would not be overccnne by the pull ofthe sheet being drawn, the bait is slowly raised from the mass of moltenglass, drawing glass from the molten mass in sheet form in a manner wellknown to those skilled in the art. Suitable means are provided forovercoming the tendency which the drawn sheet of'glass has to narrowduring the drawingnperasuch drafts and the tion, and as the operationproceeds the drawn sheet is advanced upward into the forward end of theleer over the bending roll,'by which its direction is changed from theupwardly to a substantially horizontal direction and rests on thecarrier, which carrier may be of any suitableconstruction, such,'forexample, as a carrier table composed of bars extending transverselyacross is at all exposed to sudden changes in atthe leer and connectedat their opposite ends to a pair of endless carrier chains or cables.The annealing leer and the carrier (or carriers, if the same ,is insectional form) are necessarily of very considerable length, in orderthat the necessary time may intervene between the entrance of the sheetat the forward end of the machine and its exit from the rear end, toenable the sheet to be slowly and evenly cooled, and thereby aunealed,and the weight of the long extent of sheet at any one duces a frictionalcontact of the sheet with the carrier table, which in many instanceswill be amply sufficient to afford all the draft necessary to continuethe drawing operation without the direct gripping of any positivelydriven gripping device on the sheet. In case the weight of the sheetitself is not found suilicient (as, for example, when a very thin lightsheet is being drawn) to afford the necessary draft for continuing thedrawing operation, present invention includes the step of augmenting theweight of the sheet by super imposing upon the sheet suitable materialto afford the necessary frictional contact of the sheet with the tableto provide the required draft. Preferably, the material thus employedfor augmenting the weight is inthe form of a finely powdered, highlyrefractory material which is deposited, pre

erably by surface of turned into its horizontal position upon thecarrier. Preferahly said powdered material consists of finely powderedplumbago delivered to -the-.sheet from a reservoir locate above thecarrier, though any other suitable material would be within the scope ofthe present invention.

As before stated, after the sheet of glass is drawn, it is advancedupwardly into the front end of the leeri- In thus moving upwardly fromthe point where the glass is drawn into sheet form near the surface ofthe molten glass, the sheet may be either advanced upwardly within aclosed heated chamber forming; .as it were, a vertical a continuousoperation, upon the closed connection extending from the sur-- face ofthe molten mass to-the leer, or the drawn sheet may be advanced throughthe open atmosphere where it is cooled by contact with the'externalatmosphere, and then passes into the leer. In this latter case, it isnecessary to reheat the passes over the bending roll, in order that thesheet may be safely bent over the roll without breakage. Moreover, aswill hereinafter appear, thisreheating will also.constitute the firststep in the annealing process. For the purpose of illustrating the'invention, the drawn sheet is herein shown, however, as being advancedupwardly through a closed chamber in a heated atmostime within the leerno the method of the the drawn sheet after it has been sheetbefore ittact with the external atmosphere, thouglr preferably additionalheatiis'supplied to the" It is to be the sheet at the bending point.understood, however, that wvlietliei drawn sheet is advanced upwardlythrough a closed chamber ina heated atmosphere, as herein shown, or isadvanced upwardly through an open. spa'ce,-wherein it is exposed to theexternal atmosphere, is immaterial for the'purposes of the-presentinvention, either form of procedure being 'within the spirit of tl 1is.invention.

Secondly, the invention consists in the process of annealing sheet glassby placing the same in aproperly heatedcondition on a suitable carrierat one end of an annealing leer and passing the same on through aconstantly lowering temperature inthe leer while the upper surface ofthe sheet is protected from contact with the atmosphere of the leer. Thepassed through the ous or a sectional carrier table of any suitableconstruction, protected by any suitable medium which of the sheet, whileat the same protecting the time amply Preferably the material thusemployed to any suitable mechanism, and is returned to the forward endof the leer in the operation.

surface whose temperature is too much he heat the powdered livered tothe surface of the sheet at the forward end of the leer.

Thirdly, the invention consists in an apsheet glass, in whichapparatusthere is combined a receptacle containing a. molten-mass 130 sheet maybe. leer either on a contmuand the .upper surface sheet from any suddenchanges 111 the temperature of the leer,wh1ch would result ,m breakageof the sheet.

is a conduit leading down. rom f In order to prevent any'--'suddenchilling."

paratus for the continuous production of the carrier ,will permit a veryslow radiation of the heat i protect the upper surface of the sheet isthe t assist in the drawing operation, such as which may be "simplyanex-v tension of the carrier'on which the sheet' rests within the leer,and the powdered protecting material is removed therefrom by tobe usedagain of the sheet by depos1tingmaterial upon its low that of the sheetitself, it is preferred to I" material before" it is 'deof glass, aheated chamber whichmay be the forward end of the leer located abovesaid receptacle, means for drawing a sheet of glass consisting of abait, and suitable means for elevating the baitin a substantiallyvertical direction and passing it over a suit-able bending roll, and asubstantially horizontal. moving carrier located in the leer, upon whichthe sheet rests during the drawing operation, the frictional contactbetween the sheet and the carrier affording the draft necessary to drawthe sheet of glass from the mass of molten glass in the receptacle.

without departing In that embodiment of the invention shown in thedrawings forming a part of this application, the carrier table withinthe leer and the leer itself are shown as extending substantiallyhorizontal from front to' howrear. It may be, and in some cases is,ever, somewhat inclined either upward or downward from the horizontal,and when inclined downwardly from the horizontal the draft of the sheeton the table is rendered more effective to accomplish the drawing of thesheet from the working chamber or receptacle. Where the carrier tableand leer are thus inclined, the inclination need not necessarily be verymarked or depart to any very great extent from the horizontal, and suchinclinations either above orbelow the horizontal are intended to beincluded in the expression substantially horizontal used in thedescription and the claims herein. Fourthly, the invention consists in aleer chamber having-a substantially horizontal carrier therein, combinedwith means for continuously drawing a sheet of glass and depositing itupon said carrier table, means for depositing a suitable covering,prefcrably of powdered material, upon the upper surface of the sheet onsaid'carrier table, and means for removing said covering ma tei'ial ator nearithe exit end of the leer. Preferably, there is combined with themeans for depositing the covering material upon the glass, means wherebysaid material may be heated prior to its deposit nponthe glass, and acarrying device whereby the material which is removed from the glass ator near the exit endof the leer is carried back to the frontend oft-heleerto be reheated and re-used.

The invention further resides in certain detailed steps in the methodsabove doa ibed, andin'certain improvements in the details andconstruction of the apparatus mentioned, which shall be hereinafter morespecifically described and then pointed out 1n the claims; The methodsof my lIlVOI1-' tion may be varied within certain limits vention, andthe apparatus is capable of being embodied in a variety of physicalstructures. One embodiment of the apparatus by which the methodsconstituting apart of section of the forward end of the leer and fromthe spiritof the inthe invention may be carried into practi :al

operation is illustrated. in the accompanying drawings, in which- Figure1 is a central, vertical, longitudinal 7O ofthe working chinnber,showing also the fragmentary end of the melting furnace andof thecarrier for returning the powdered material and the hopper from whichsaid material is deposited upon the surface ofthe glass sheet; Fig. 2 isa detailed top plan view shmving the carrier and the hopper for thepowdered material; Fig. 3 is a central, vertical, longitudinal sectionthrough the entire apparatus, which; is broken away in the center toshorten the figure; and Fig. 4: is a side elevation of Fig. 1.

Referring to the drawings, in which like reference numerals indicatecorresponding parts throughout the several views, the ref erence numeral1 indicates a receptacle containing a mass of molten glass 2 deliveredinto said receptacle from any suitable source, as from a melting furnace3, which is here shown as in open communicationwith the workingreceptacle, to the end that the hot gases from. the furnace may passdirectly into the','1'eceptacle 1, for the purpose of maintaining thesame at the proper temperature, reliance being also placed on n suitableburner or burners l on the opposite side of the receptacle 2 from thefurnace 3. Located on a plane above that of the receptacle or workingchamber 1 is a leer 5 whose forward end projects over the workingchamber 1 and has an opening 6 in the bottom part of its 'l'orward end,which opening is immediately above and in line with an opening 7 throughthe cover of the working chamber or receptacle 1, the openings t) and 7combined constituting a closed passage-way leading from the receptacle 1into the forward end of the leer 5. Within this forward end of the leer5 is a bending roll 8 which may be either a power-driven roll no or anidler roll driven by the frictional contact of the sheet of glass as itpasses over said roll. Within the leer 5 there isplaced a carrier table9, here shown as substantially horizontal, and as extending from end toend of the leer in a. substantially horizontal direction, the'rearportion 10 of said table carrier table, instead of being one continuouscarrier table as here shown, may, if desired, be made up of severalSECUOIIS. As here showmhowever, the same is a cont1nuous carrier tableconsisting of transverse bars carried by a pair ofi'sprocket chains 11passing over suitable sprocket wheels and driven from any suitablesourceof power. The forwa rd end of the leer 5 is heated in any sail-ablemanner, as by means of the 15';

ering to the working chamber 1. Mounted.

hot gases passing upward through the open-' ings t3 and? from theworking chamber 1, augmented by the heat from burners 12 in the forwardwalls of the leer, and, if desired. still further augmented by burners13. 13, located in the walls of the tile covwhich is in opencommunication through i ports or holes 17 with the interior of the leer,and which is provided with small. exit ports 18 formed through the wallsof the casing 16, the construction being such that 20 the hot gases willbe permitted to circulate around the lower portion of the hopper 11within the casing 16, admission of the gases being from the leer 5through the ports 17, and the escape oi the gases being through theports .18.

Any suitable means may be provided for removing the covering material 19from the surface of the glass as it issues fully annealed from the rearend of the leer, and as here shown, said means consistof a. re volvin-gbrush 2O placed at an angle across 1 the surface of the glass at theexit end of the leer, and acting .to brush the powdered coveringmaterial from the surface of theglass into the enlz'irged mouth-end 21,ot' a conduit 22, leading to the bottom end 23, i ot an elevator 24, orany suitable construction, and by means of which the powdered materialis elevated and delivered through the spout- 25, onto an endless carrier26, by which it is returned to and deposited in the hopper 14. a

, For the purpose of driving the endless carrier- 9, the brush 20, theelevator 2 t, and the carrier 26, a power shaft 27 is connected bysuitable driving belts or sprocket-chains 28,- 29, 30 and 31, with thevarious elements to be driven, all of which will be readily understoodby an inspection of Fig. 3.

In order to regulate the amount of powdered material delivered fromthehopper 1 1 onto the surface of the continuously moving sheet of glass, asuitable valve 32, Fig. 1, is mounted within the hopper 14 so as tonormallyclose' the upper end of the delivery spout 15. The bottom ofthe'hopper 9' is preferably formed curved or arc-shaped incross-section,- and the valve 32 is shaped to conform to said surface,and is mounted on a rock-shaft 33, having a handle 34, rigidly securedthereto and normally engaging a notched bar or ratchet 35 (see Fig. 1)on the exterior of the machine. The valve 32 referably is not of thesame width entirely across the bottom of the hopper 1.4, its forward orcontrolling edge being formed on a curve, as shown at 33, Fig. 2, tothe'end that the opening of the delivery spout 15 is first uncovered atthe center, and then as the I opening is -further moved the openinggradually widens, thus depositing a greater amount of covering or,weight-1n material at the centerthan at the edges 0 the sheet. It willbe understood, however, that the working edge of the valve 32 might bemade straight so that the covering or'weighting material would bedeposited in equal thickness entirely across the sheet.

For the purpose of initiating the operation, there is provided a bait'36of any suitable construction, as for instance a metal bar, which isattached to one end of chains I so.

37, the other end of which is "attached to a weight 38.

Operation: The molten glass 2 in the working chamber or receptacle 1having 3 been properly tempered, the bait 36 attached to the chains 37is lowered over the bending roll 8 through the openings 6 and 7untilthe' bait rests within the mass of molten glass,

the weight 38 attached to the other end of the chains .37 restingupon'the carrier table E). The valve 32 being closed, the machine isstarted, the carrier slowly moving the weightin the direction ndicatedby the arrow in Fig. 1, thus slowly elevating'the bait "from the mass ofmolten glass 2, which as it emerges from the molten glass, draws a sheetof glass after it. For the purpose of overcoming the narrowing tendenc--'of the sheet, any suitable means are emp oyed, as the grippingfingers 39, 39, which engage the edge portions of the sheet and restrainit against the tendency to narrow. The sheet of glass having been drawnfrom the surface of the-molten mass of glass 2, is slowly advanced as adrawn sheet upward through the openings 7 and 6 into the forward end ofthe leer 5 and over the bending roll 8, heat being supplied from theworking cham her and from the burners l2 and 13 to insure the sheetbeing sufliciently plastic at the'bending roll 8 to turn thereoverwithout breakage. The drawn sheet having been advanced upward throughthe openings 7 and (3 and over the bending roll 8, is deposited upon thecarrier table 9, and after the forward end of the sheet is. advancedpast the spout e material, the operator (in case it is desired toaugment 15 for delivering the powder the weight of thesheet or topragtice theanneahng process described herein). operates the valve 32 bymeans of the handle 34, setting it into the position required to deliverthe desired amount of the powdered material, as plumbago, onto thesurface of the moving sheet of glass. As the sheet slowly advancesthrough the leer, moving toward th exit end thereof, the temperature ofthe leer gradually decreases from the forward essaissa is moved on thecarrier through the leer slowly enough to permit'it to gradually anduniformly lose its heat, thus accomplishing the annealing of the sheet.The rapidity with which the sheet thus parts with its heat v may belargely controlled, not only by the decrease in temperature in the leer,but by the amount of covering material delivered to the upper surface ofthe sheet. Moreover, this covering material serves to protect the sheetfrom any cold drafts or other cooling means, which might set up anuneven contraction of the sheet, resulting in its breakage.

ered to the carrier 26, and thence to the hopper 14;. The material whenit reaches the hopper 14: will contain more or less heat, but for thepurpose of insuring that it shall be warm enough to avoid any chillingaction when it is delivered to the surface of the warm sheet, the hotgases in the chamber 16 surrounding the hopper lei serve to heat themass of powdered plumbago in the hopper, when it is again deliveredthrough the spout on to the surface of the sheet.

-While various covering materials might be employed within the spirit ofmy invention, I prefer to employ powdered plumbago, since the latter, incase it falls from the sheet and gets into the bearings or in contactwith other moving parts of the mechanism, not only would not injure thesame nor interfere with their movement, but would, on the contrary, actas a lubricant.

What is claimed is 2-- 1. The method of drawing sheet glass,

.which consists in preparing a mass of molten glass, drawing a sheet ofglass from said mass and resting it upon a suitablp carrler,

- and then continuing the drawing operation by applying the draft to thedrawn portion of the sheet through the frictional contact of said sheetwith the carrier.

2. The method of drawing sheet glass, which consists in preparing a massof molten glass, drawing the shoot upwardly from said mass, then turningthe drawn sheet from its upward to an approximately horizontal directiononto a suitable carrier, and continuing the drawing operation byapplying the draft to the drawn portion of the shoot. through thefrictional contact of said sheet with the carrier.

3. The method of drawing sheet glass, which consists in preparing a massof molten glass, drawing a sheet of glass from said mass and resting itupon a suitable carrier,

augmenting the weight of the sheet by superposing suitable materialthereon, and continuing the drawing operation by applying the draft tothe drawn portion of the sheet through the frictional contact of saidsheet with the carrier.

4. The method of drawing sheet glass, which consists in preparing a inass of molten glass, drawing a sheet of glass from said mass and restingit upon a suitable carrier, augmentin the weight of the sheet bysuperposing fine y divided material thereon, and continuing the drawingoperation by applying the draft to the drawn portion of the sheetthrough the frictional contact of said sheet with the carrier.

5. The method of drawing sheet glass, which consists in preparing a massof molten glass, drawing a sheet of glass from said mass and resting itupon a suitable carrier, augmenting the weight of the sheetbysuperposing finely divided plumbago thereon, and continuing thedrawing operation by applying the draft to the drawn portion of thesheet through the frictional contact of said sheet with the carrier. I

6. The method of making sheet glass. which consists in preparing a massof molten glass, drawing a sheet of glass from said mass and resting itupon a suitable carrier, retarding radiation of heat from one surface ofthe sheet by the application of a suitable covering, while passing thesheet through an atmosphere of gradually decreasing temperature.

7. The method of making sheet glass, which consists in preparing a massof molten glass, drawing a sheet of glass from said mass and resting itupon a suitable carrier, retarding radiation of heat from one surface ofthe sheet by the application of a covering of powdered material whilepassing the sheet through an atmosphere of gradually decreasing,temperature.v

8. The method of making sheet glass, which consists in preparing a massof molten glass, drawing a sheet of glass from said mass and resting itupon a suitable carrier, retarding radiation of heat from one surface ofthe sheet by the application of a covering of powdered plumbago whilepassing the sheet through an atmosphere of gradually decreasintemperature.

9. The method of (making sheet glass, which consists in preparing a massof molten glass, drawing a sheet of glass from said mass, reheating saidsheet after the cooling incident to the drawing operation, resting thereheated sheet on a suitable carrier, retarding the radiation of heatfrom the upper surface of the sheet by the application of a suitablecovering. and then passing the cov- I which consists in preparing a massof molten glass, drawing a sheet of glass from said mass, reheating saidsheet atter the cooling incident .to the drawing operation, resting thereheated sheet on 'a suitable carrier, re-

tarding the radiation of heat from the upper surface of the sheet by theapplication of a covering of powdered plumbago, and then passing thecovered sheet through an atmosphere of gradually decreasing 'tempeature.

12. The method, of making sheet glass, which consists'in preparing amass of molten glass, drawing a sheet of glass from said mass, reheatingsaid sheet after the cooling incident to the drawing operation, restingthe reheated sheet on a suitable carrier, retarding the radiation ofheat from'the upper surface of the sheet by the application of asuitable heated covering, and then passing the covered sheet through anatmosphere of gradually decreasing temperature.

13. The method of making sheet glass, which consists in preparing a massof molten glass, drawing a sheet of glass from said mass and resting itupon a suitable carrier, retarding radiation of heat from one surface ofthe sheet by the application of a suitable heated covering While passingthe sheet through an atmosphere of gradually decreasing temperature.

14:. In an apparatus for drawing sheetglass, .the combination of areceptacle containing a mass-of molten glass, a horizontallyextendingleer in a plane above said receptacle, a bending roll in one end of saidleer, a sheet-glass carrier in the leer, means drawing a sheet of glassfrom said receptacle oversa'id bending roll onto said carrier, and meansaugmenting the weight of the sheet on the carrier.

} 15. In an apparatus for drawing sheet glass, the combination'of areceptacle containing a mass of molten glass, means drawing a sheet ofglass therefrom, a carrier on which the drawn sheet is deposited andwhich continues the drawing operation solely by the frictional contactof the sheet with the carrier.

16. In an apparatus for drawingsheet glass, the combination of areceptacle containing a mass of molten glass, means drawing a sheet ofglass therefrom, a carrier on which the drawn sheet is deposited, andmeans depositing weighting material on said sheet during the drawingoperation.

17. In an apparatus .for drawing sheet glass, the combination of areceptacle containing a mass of molten glass, means drawing a sheet ofglass therefrom, a carrier on which the drawn sheet is deposited, and ahopper above said carrier and from which pulverized material isdeposited during the drawing operation.

18. In an apparatus for drawing sheet glass, the combination of areceptacle containing a massof molten glass, means drawing a sheet ofglass therefrom, a carrier on which the' drawn sheet is deposited, meansdepositing weighting material on said sheet during the drawingoperation, and automatic means removing said material from the sheet.

19. In an apparatus for drawing sheet glass, the combination of areceptacle containing a mass of molten glass, means draw ing a sheet ofglass therefrom, a carrier on which the drawn sheet is deposited, a hopper above said carrier and from which pulverized material is depositedduring the drawing operation, and a revolving brush removing saidmaterial from the sheet.

20. Inan apparatus for drawin sheet glass, the combination of a receptace containing a mass of molten glass, means drawing a sheet ofglasstherefrom, means depositing a weighting material on said sheet, andmeans heating said material prior to its deposit.

21. In an apparatus for drawing sheet glass, the-combination of areceptacle containing a mass of molten glass, a leer in a planeabovesaid receptacle, a carrier in said leer, means initiating thedrawing of a con tinuous sheet of glass from said receptacle anddepositing it on said carrier, means supplying heat to said sheet whereit enters the leer, and means depositing a covering material on saidsheet during the drawing operation.

225111 an apparatus for drawing sheet p eaaaee taining a mass of moltenglass, a leer in a. plane above said receptacle, a carrier in said leer,means initiating the drawing of a conin u h et 0f glass from saidreceptacle and d p si ing it'on said carrier, a ho per containingpulverized material and hem which said material is 'deposited'on saidsheet, means heating the material in said hopper, means removing saidmaterial from the sheet, and means returning the removed material to thehopper.

24.. In an apparatus for: drawing sheet glass, means for drawing asheet, of glass, in,-

eluding a carrier on which the drawn sheet rest-s, a hopper locatedabove the carrier and 5 containing pulverized material, and from whichsaid material ia deposited on the sheet, and adjustable means regulatingthe rate of deposit of said material.

In tebiimouy whereof I have signed this specification in the presence oftwo subscrilr JOHN PLAYER.

mg witnesses.

Witnesses WILLIAM A. ADAMS, ST. CLAIR L. H m.

